linux-kernel - RE: [PATCH RFC v2 00/18] Add VFIO mediated device support and DEV-MSI support for the idxd driver

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Message-ID: <MWHPR11MB1645EF668732BFA7A1219CC58C5F0@MWHPR11MB1645.namprd11.prod.outlook.com>
Date:   Mon, 17 Aug 2020 02:24:28 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>, Jason Wang <jasowang@...hat.com>
CC:     Alex Williamson <alex.williamson@...hat.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "Dey, Megha" <megha.dey@...el.com>,
        "maz@...nel.org" <maz@...nel.org>,
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        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
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        "Liu, Yi L" <yi.l.liu@...el.com>, "Lu, Baolu" <baolu.lu@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
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        "Ortiz, Samuel" <samuel.ortiz@...el.com>,
        "Hossain, Mona" <mona.hossain@...el.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
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Subject: RE: [PATCH RFC v2 00/18] Add VFIO mediated device support and DEV-MSI
 support for the idxd driver

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Friday, August 14, 2020 9:24 PM
> 
> The same basic argument goes for all the points - the issue is really
> the only uAPI we have for this stuff is under VFIO, and the better
> solution is to disagregate that uAPI, not to try and make everything
> pretend to be a VFIO device.
> 

Nobody is proposing to make everything VFIO. there must be some
criteria which can be brainstormed in LPC. But the opposite also holds - 
the fact that we should not make everything VFIO doesn't imply
prohibition on anyone from using it. There is a clear difference between 
passthrough and userspace DMA requirements in idxd context, and we
see good reasons to use VFIO for our passthrough requirements.


Thanks
Kevin